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How bird vomit helps us understand history

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Sounds disgusting, doesn't it? How in the world can bird vomit help us learn about the past history or ecology of an area? What can be found in a regurgitated pellet that may provide clues? The Brain Scoop explains. 

Similar to rock strata, usually, the youngest owl pellets in a pile are found at the _______ and the oldest at the ____________.

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